RetainWallTieToDitch

Attachment

The attachment point is on the inside of the shoulder.

Input Parameters

Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1), unless indicated as a percent slope with a “%” sign.

Parameter	Description	Type	Default
Side	Specifes to insert the subassembly either on the right or the left side of the attachment point.	Left / Right	Right
Shoulder Width	Width of the shoulder from the attachment point	Numeric, Positive	4.0 ft 1.33 m
Pave 1 Depth	Depth of Pave 1, Enter ZERO if no Pave 1	Numeric, Positive	0.083 ft 0.025 m
Pave 2 Depth	Depth of Pave 2, Enter ZERO if no Pave 2	Numeric, Positive	0.083 ft 0.025 m
Base Depth	Depth of base layer	Numeric, positive	0.333 ft 0.1 m
Subbase Depth	Depth of the subbase layer.	Numeric, positive	0.3 m 1.0 ft
Wall Width	Specifies the width of the wall.	Numeric	0.958 ft 0.292 m
Footing Cover	The depth of cover from the top-of-footing to the finish grade line on the back side of the wall in fill or to the hook when in cut.	Numeric	1.667 ft 0.50 m
Key	Species to add an optional key below the footing	Boolean	Yes
Use Barrier	Specifies to use a barrier on the top of the wall	String, (a) Yes, (b) No	Yes
Use Superelevation Slope	Specifies to use superelevation slope	Selection list	No
Slope Direction	Specifies whether the shoulder slopes away from the crown or towards the crown	Selection list	Away from Crown
Default Shoulder Slope	Default cross slope of the shape surface. The value is used if the superelevation slope is not used or is not specified for the baseline alignment.	Numeric, Positive	- 2.0%
Walk Width	Width of the walkway link on the tie slope	Numeric, Positive	3.300 ft 1.0 m
Walk Slope	Slope of the walkway link (grade/slope type)	Numeric	25 %
Fill Slope	Slope of the fill link from the walkway to the tie point (Slope type)	Numeric	2.00 : 1
Toe Width	Width from ditch point to the tie point (to existing inside edge of the ditch)	Numeric, Positive	1.670 ft 0.5 m

Wall height is determined from top of the footing to attachment point of ground elevation on the vertical face, whichever is higher. Wall battered slope, width of the footing, offset of wall vertical face, optional key dimensions, and the location of the key center are all functions of the wall height.

Target Parameters

This section lists the parameters in this subassembly that can be mapped to one or more target objects, such as a surface, alignment, or profile object in a drawing. For more information, see in the AutoCAD Civil 3D User’s Guide Help.

Parameter	Description	Status
Edge of Shoulder	May be used to override the shoulder slope by tieing to a profile. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Ditch Offset	Inside edge of ditch profile used to locate Tie Point. The following object types can be used as targets for specifying this offset: alignments, polylines, features lines, or survey figures.	Required
Tie-in Surface	Existing ground surface to tie in with respect to specified ditch and toe width. The following object types can be used as targets for specifying this surfaces: surfaces.	Required

Output Parameters

None.

Behavior

This subassembly can be inserted either on the left or the right sides. The attachment point is assumed to be at the design edge-of-traveled-way, from where the paved shoulders will be drawn as specified by this subassembly.

The top-of-footing elevation is determined by working inwards from the Tie Point to the inside edge of walkway, then subtracting the Footing Cover from the tie link at the offset of the outside footing corner. The height of wall (H) is calculated between the Outside Edge of the Shoulder and the top of footing. If the Key option is set to No, then the base of the footing is a single horizontal link. If the Key option is used, links to define the optional key are inserted.

Note: A very small gap (0.001 for m) is left between the pavement layers and the inside face of wall. This is to facilitate material analysis using the quantity takeoff feature, as shown in the detail below.

Layout Mode Operation

In layout mode, the subassembly draws the retaining wall shape as specified by the input parameter values, assuming that the subassembly is in a fill condition.

Point, Link, and Shape Codes

The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.

Point/Link	Codes	Description
P2	Daylight
P3	Walk_Edge	Edge of the walk width
P14	RW_Hinge
P12	RW_Inside	Could be used as breaklines in building datum surface
P5	RW_Outside	Could be used as breaklines in building datum surface
L1, L2, L3	Top
L2, L3	Wall
L4,L5,L6	Footing	Bottom of the footing
L7	Pave1
L8	Pave2
L9	Base, Footing_Bottom
S1	RWall
S2	Barrier
S3	Pave1
S4	Pave2
S5	Base

Coding Diagram